This data set contains polygons delineating the seamline boundaries of imagery acquired as part of the National Agriculture Imagery Program (NAIP), and used in the creation of DOQQs and compressed county mosaics (CCM). These seam polygons can be used as a tool in determining the image source and date of each portion of the DOQQ or the CCM.

The NAIP acquires 4 band digital ortho imagery from airborne and/or space based platforms during the agricultural growing seasons in the U.S.. A primary goal of the NAIP program is to enable availability of ortho imagery within sixty days of acquisition. The NAIP provides 1 meter or 1/2 meter GSD ortho imagery rectified within +/- 6 meters to true ground at a 95% confidence level. The tiling format of NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 300 (plus or minus 30) pixel buffer on all four sides. The NAIP quarter quads are formatted to the UTM coordinate system using the North American Datum of 1983 (NAD83).

(Note: The Minnesota Geospatial Information Office (MnGeo) has created this metadata record to describe the entire NAIP 2013 seamline shapefile dataset, using information from Farm Service Agency metadata. Each seamline shapefile is accompanied by the original FSA metadata for that county.)

Purpose

This index aids USDA Agencies in identifying source acquisition date boundaries for the compressed county mosaic as they administer USDA programs for their customers.

The Aerial Photography Field Office asks to be credited in derived products.

Redistribution conditions: In obtaining this data from MnGeo, it is understood that you and/or your organization have the right to use it for any purpose. If you modify it, you are encouraged to apply responsible best practices by documenting those changes in a metadata record. If you transmit or provide the data to another user, it is your responsibility to provide appropriate content, limitation, warranty and liability information as you see fit.

All data have been reviewed for correct application of attributes and are accurate to current conditions.

Logical Consistency

USDA-FSA Aerial Photography Field Office relies on the integrity of the original data collection which was performed by private contractors. Data integrity was validated by the responsible private contractor or sub-contractor. Polygon and chain-node topology present. There are no duplicate arcs and no dangling nodes. The data set contains polygons that do not overlap, there are no polygons that are entered twice, and all areas are completely described. The area features are topologically structured with nodes at all intersections. The dataset is comprised of polygons delineating portions of each exposure used as source data for each part of the NAIP imagery, with no gaps in coverage. Attribution includes acquisition dates and times.

Completeness

To the best knowledge of the USDA-FSA Aerial Photography Field Office this digital data set is complete with no required elements left unrepresented according to contract specifications.

Horizontal Positional Accuracy

None

Vertical Positional Accuracy

N/A

Lineage

This ESRI shapefile was created using ESRI ArcMap 9.3.1. A script was used to take the seam output from OrthoVista and output the polygon shapefile. The attribute data is take from the image acquisition data.

Note: The files will be in either UTM zone 14 or 15, depending on which zone covers the majority of the county.

1. To obtain all of Minnesota's seamline shapefiles (1 per county), click below after Online Linkage. Doing so will tell your browser to start downloading a compressed 'ZIP' file which will contain the following:

One folder per county, each containing:
- Shapefile (.shp, .shx, .dbf, .prj)
- Original FSA documentation (.txt, .xml) for the data set

2. A county's seamline shapefile is also included with each NAIP2013 county mosaic file downloadable from the U.S. Dept. of Agriculture, Natural Resources Conservation Service's Geospatial Data Gateway site: datagateway.nrcs.usda.gov

Online Linkage

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to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process or link to download information. See "Ordering Instructions" above for details.